Means for controlling the warp in looms



R.' DELEU March 19, 1929;

MEANS FOR r`-ONTROLLING THE WARP IN LOOMS Filed July 2, 1928' lli/ VENTURI o'loerT Bde u I w/m'ess Patented Mar. 19, 1929.

Mbit?? ROBERT DELEU, 0F IAEAIRLAWN, NEW J MEANS `FOR CONTROLLING l'DI-IE HARP IN' LOOVMS.

Application inea July a, 192e. sei-iai No. 239,655.

The object of this linvention is to provide means for controlling the warp in a loom `in kthe use of which the goods may be woven so as to avoid the presence of so-called shiers or undue spacing of some of the weft threads, or so-called barrel7 marks, or too close arrangement of such threads; In ordinary let-offy mechanisms a rope is wound one or more times around the beam-head to Serve as a brake7 and at the rear end of the rope a tension weight is suspended and at the forward end a lighter weight which is adapted to touch the licor or equivalent from time to time as the rope is paid out and so produce a compensating backward slippage of the rope on the beam-head. Due to atmospheric conditions affecting the rope and other causes it is impossible to prevent slippage which is not at times spasmodic, and this gives rise to the said shiers and barre marks. It has been proposed to use, instead of the lighter weight which intermittently touches the iioor, a spring to hold the forward end of the rope under tension, and such expedient I find helpful and preferably use.

But in the case of the finer quality of goods even this does not entirely7 remove the fault indicated and hence I have provided for a yielding support for the warp at the point usually assumed by the whip-roll. not broadly new, but it is new to provide the particular yielding substitute for the whiproll. herein set forth. While my improvement is preferably used with that brake-means for the warp-beam in which the rope wound around the beam-head has its rear end tensioned in some way, as by al weight, and its forward end controlled by a spring, as explained it will be understood that any friction braking means for the beam may be employed. Y

F or my whip-roll substitute I use a bar extending transversely of the warp and around and in contact with which the warp is adapted to extend, said bar being pivoted in the loom frame on an axis transverse of the warp and having its warp-engaged surface convex and curved eccentrically away from said axis in relatively the direction in which the warp extends from the beam, and yielding means normally urging the bar to turn in the direction to press said surface against the warp.

In the drawing,

Fig. 1 is a side elevation of the rear part of va loom embodying the improvement;

Fig. 2 is a side elevation, partly in section Such in itself isand on a larger scale7 of my wllip-roll-substi- GoV the head of the beam 2 in the usual way and 5 is a weighted lever fulcrumed in a stand 6 andv connected to the rear end of therope and acting to tension the warp A. The forward end of the rope is connected to a plunger 6 arranged to vslide vertically inan upstanding bracket 7 which may be secured to the floor and between a suitable abutment 8 `on the plunger and the top of the bracket is a spring`9 which the weighted lever 5, acting through the rope, normally tends to vmaintain in a state of con'lpression.

Constituting in effect a part of the loom fra-ine is a pair of spaced brackets 10 (one at the near side and the other at the far side, Fig. 2) of the warp. In this pair of brackets are pivoted on a horizontal axis the trunnions 11 of a bar 12. This barA is curved transversely of said axis and has a surface 13 which is convex Vand curved eccentrically away from said axis. The bar is mounted in the brackets 10 so that the eccentricity of its said convex surface 13 shall increase away from said axis in the direction in which the warp extends from the beam. At each end of the vbar and near that edge thereof which is remote' from said axis it is supported by a cushioning support. Each support consists of a stem 14 which is pivoted on a horizontal axis .1 5l inan upstanding bracket 16 constituting a part of the loom frame and has a shoulder at 1,7 and loosely penetrates the bar The bar is thus adapted to yield as the Warp is drawn from the beam and according as the resistance by the beam to its advance varies: if for any reason there should be a sudden change in such resistance the same will be gradually compensated for by the bar, the Vgradual nature of such compensation being 'essential in order to prevent the named defects in the fabric and being largely due to the eccentricity of the bars surface 13.

I claim:

In a loom, the combination, with support` ing means and a Warp beam journaled therein and braking means for the beam, of a bar extending and pivoted on an axis also extending transversely of the Warp and around and in contact with which bar lthe warp is adapted to extend, said bar having its Warpengaged surface convex and curved eccent'rieally away from sai-d axis in relatively the direction in which the Warp extends from the beam and' a cushioning support upon which the bar rests at a point removed from its said axis, said support being pivoted in said supporting means on an axis parallel with, and being capable of shifting, relatively to the bar transversely of, the first-named axis.

' In testimony whereof I ailix my signature.

ROBERT DELEU. 

